Elsevier

Nuclear Physics A

Volume 519, Issues 1–2, 3 December 1990, Pages 231-240
Nuclear Physics A

Subthreshold production of pions in coincidence with light particles

https://doi.org/10.1016/0375-9474(90)90630-5Get rights and content

Abstract

He ions have been detected in coincidence with charged pions in the reactions 16O on 27Al at Elab = 94 MeV/u. We analyse velocity spectra and cross-sections of He ions emitted in the angular range 40 ÷ 1500 in coincidence with charged pions detected at 900. A two source emission mechanism of the helium particles and a pion statistical production from an equilibrated participant zone is stressed. The absolute yields at different angles are compared with results of a theoretical model for medium energy heavy ion reactions in the frame f a participant-spectator picture. A comparison of the pion energy spectra with Boltzmann-Nordheim-Vlasov calculations and a discussion on the time scale for pion emission is also presented.

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Permanent address: Institute of Modern Physics, Lanzhou, P.R. China

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